Long Island's Ritz-Carlton Residences, North Hills is among the poshest new turn-key communities rising across the tristate. Neoscape

Great Neck native Stephen Dallal was ready to trade his spacious King’s Point house for something more manageable. Now that his two daughters are living in the city, the North Shore dentist turned his eye toward a condo at Long Islands’s new Ritz-Carlton Residences in nearby North Hills.

“We were looking not only to downsize, but also to have everything taken care of,” Dallal says. He and his wife, Rhonda, had stayed at many Ritz-Carlton hotels, and imagined it would be fantastic to have that level of service at home.

“They will have a concierge, a valet, dry cleaning drop-off, the ability to make travel arrangements — basically everything you get with a hotel concierge,” he says. “It will be like we’re on vacation, but 30 minutes from Manhattan.” He plans to move into his three-bedroom as soon as the project is ready next spring.

Turn-key communities within striking distance of Manhattan are cropping up all over Long Island and Westchester. From waterfront gated townhouses with private marinas to compact multi-family dwellings where you can walk to an amenity-laden clubhouse, these high-touch planned neighborhoods deliver all the benefits of owning a suburban home, along with the perks city people are used to — doormen, common areas, concierges, gyms — and hassle-free to boot.

Shockingly, these developments offer value, too. “With housing prices rising faster in Manhattan, those that are seeking these services are looking outside the city,” says Jonathan Miller, president and CEO of Miller Samuel, a real estate appraisal and consulting firm he co-founded in 1986.

Stephen Dallal’s new home at the Ritz-Carlton Residences comes with five-star services.Abby Sheeline

The existence of these so-called “suburban urbanites” began nearly a decade ago, according to Joe Graziose, senior vice president of tristate developer RXR Realty. His firm acquired the 17-acre North Hills property in 2007 and brought in Ritz-Carlton to mastermind 244 residences spread across five buildings.

“We saw many people that didn’t want to live in a big house on the hill anymore,” he says. At his white-glove village 20 miles from the Midtown tunnel, owners can play on the golf simulator in the 25,000-square-foot clubhouse, host a catered movie night in the 40-person screening room or have someone walk their dog while on vacation. “You are not in Florida for three months worrying that a pipe is going to burst,” Graziose says. He calls it the “lock-and-leave” lifestyle. Sales launched in June and the property — whose available units range from 1,500 to 2,000 square feet and average $1,200 a foot and from $1.32 million to $2.95 million — is 75 percent sold out.

Ocean Watch homes come with a boat slip.Handout

Farther out on Long Island, Ocean Watch at Harbor Pointe caters to the boating crowd. Tucked between Merrick and Freeport, the new-construction complex has 61 townhouses with unobstructed water views — and a 1-to-1 slip ratio that can accommodate boats up to 60 feet long. Across the street, buyers have access to Cow Meadow Park and its six tennis courts, as well as a nearby rec center that houses a state-of-the-art gym, five swimming pools and even an indoor ice-skating rink.

Because the private community stands outside those amenities, homeowners’ fees needn’t cover their costs — which is why the two- to four-bedroom townhouses that range in price from $559,000 to $975,000 only command $192 a month in association fees that cover tending to the boat slip, landscaping, trash and snow removal.

“Freeport really is a hip town, with a diverse community in the fishing capital of the world,” says Douglas Elliman’s Doreen Teta. “Why would you want to live anywhere else?”

The Hamptons’ gated Ponquogue Point.Handout

Then there’s Ponquogue Point, a gated community in the Hamptons offering up some hefty competition. Ponquogue Point is erecting 23 residences in four buildings that appeal to those out East who don’t want to brave the one-lane traffic on Route 27. The cedar-shingle homes are being built out “core and shell,” per buyers’ requests, says sales director Kimberly Scarola. “When we started to show the houses in 2014, we found that people would say, ‘Oh, I wish I could move this wall,’ so we decided to let them. This way, you can really do what you like inside.”

The homes, which range from $725,000 to $2 million, are selling to owners already familiar with the area who are “over 50, sick of the long drive to the Hamptons, and don’t want to manage the pool guy and landscaper anymore,” Scarola says. Nor do they want to maintain their properties over time, which is why architect Bernard Zyscovich kitted them out with zero-maintenance decking, siding and railings. The three-acre development, which also will have a marina, launching ramp, pool and concierge, has already sold seven homes.

A Greystone on Hudson spred in Irvington, NY.Greystone Mansion Group

Of course, if living the amenity-rich suburban lifestyle but trading up is your goal, there’s always Greystone on Hudson, in the riverside hamlet of Tarrytown. Modeled on the Gilded Age mansion towns of Tuxedo Park and Conyers Farm — a 1980s Greenwich banker bolthole — the 100-acre gated community will have 21 two- to five-acre estates that will have houses starting at 8,000 square feet and up. They’re priced accordingly, from $5 to $25 million. A guarded gatehouse and concierge are part of the (relatively cheap, by Manhattan standards) $1,400-a-month fees.

A posh library at Greystone on Hudson.Greystone Mansion Group

“There is a need for this New York City lifestyle in the suburbs, and no one else is doing this,” says Andy Todd, president of Greystone Mansion Group, which launched the project in 2011 and is building homes as demand dictates. At $9 million, the first estate to sell, in July, was a relative bargain: the 17,000-square-foot house has an indoor basketball court and a backyard as big as a football field.

“For the same money in Manhattan, you’d get a few square feet in a building, but here you’re overlooking castles and the River,” says Todd. An 8-foot-high-fence surrounds the perimeter. “We’re talking to Wall Street, celebrities and wealthy businessmen,” says Todd, who believes this safe, gated, concierge-served enclave will help foster a close-knit family life. John Gomes, of Douglas Elliman’s Eklund-Gomes Team, who just signed on to market and sell the homes, has his sights set higher: “I can’t help but think that the perfect buyer is the Obamas. It’s beautiful and easy to come in and out. And we can custom-design to his standards.” (Gomes is also rumored to be looking at a place for himself.)